Laminated Glass Parallel Wiring for Uniform Heating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrically heatable laminated glass for vehicles faces challenges in achieving uniform heat distribution and aesthetically pleasing designs, particularly on non-rectangular side glass surfaces, where the complexity of the current flow path and visibility of conductive elements compromise both heat uniformity and appearance.
Innovation Solution
A laminated glass design featuring conductive thin wires arranged in parallel between intermediate adhesive layers, with bus bars positioned alongside the glass edges, ensuring a uniform resistance distribution within 10% of the average value, allowing for efficient heat generation and improved appearance by minimizing the visibility of conductive elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thin metal wiring is attached to an intermediate adhesive layer, then electric heating function is achieved, but appearance is compromised and heat uniformity is difficult to achieve on non-rectangular shapes
Solution Approach 1:
The conductive wiring is divided into multiple parallel thin wires instead of a single continuous metal layer. This segmentation allows independent arrangement and connection of each wire, simplifying the overall current flow path while maintaining heating function across complex glass shapes
Solution Approach 2:
The wiring structure transitions from a planar 2D arrangement to a 3D configuration with vertical stacking between intermediate adhesive layers. This dimensional change allows bus bars to be positioned at edges rather than across the glass surface, simplifying the current path and improving appearance
2Ease of manufacture
If bus bar is arranged alongside the lower side for protection and appearance, then concealment area is improved, but current flow path becomes complicated
Solution Approach 1:
The bus bar arrangement moves from a planar 2D layout to a 3D configuration where bus bars are positioned vertically at the edges of the glass. This dimensional repositioning allows current to flow along the perimeter rather than across the surface, simplifying the current path while maintaining protective sealing
3Reliability
If insulating wiring is used to divide conductive coating segments, then conductive elements are protected, but appearance is degraded
Solution Approach 1:
The insulating function is extracted from the wiring structure itself and provided by the intermediate adhesive layers between the glass plates. This eliminates the need for visible insulating wiring on the glass surface, simplifying the overall structure while maintaining electrical isolation
Solution Approach 2:
The intermediate adhesive layers serve as an intermediary substance that provides both mechanical bonding and electrical insulation. This mediator eliminates the need for separate insulating wiring components, reducing structural complexity and improving appearance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances heat uniformity and appearance by ensuring consistent heating across the glass surface while concealing the bus bars and wiring, effectively addressing the challenges of non-rectangular shapes and visibility issues in electrically heatable laminated glass.
Implementation Method 1
a resistance value of each of the conductive thin wires is within a range of 10% or less with respect to an average value of resistance values of the conductive thin wires
Data Source
AI summary
A laminated glass includes a pair of glass plates facing each other, a pair of intermediate adhesive layers positioned between the pair of glass plates and in contact with the respective glass plates, a wiring positioned between the pair of intermediate adhesive layers, and one set of bus bars connected to the wiring. The wiring includes conductive thin wires arranged in parallel with each other between the bus bars. The bus bars are arranged alongside a same edge of the glass plates. In an area corresponding to at least a part of a principal face of the glass plates, the conductive thin wires are arranged as one aggregation and include at least one turnaround. A resistance value of each of the conductive thin wires is within a range of 10% or less with respect to an average value of resistance values of the conductive thin wires.